What type of food items does the bird try to eat; does it have favourite treats? Has the chook been to the veterinarian? If you are buying a youthful fowl, ensure it can be fully feathered and totally weaned (doesn't need to be syringe fed or mother or father fed). https://cockatielforsale40627.blogolize.com/little-known-facts-about-cockatiel-for-sale-72344861